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Dot Product of Two Vectors

In the isosce...

Question

In the isosceles $△$ ABC, $| A B | = | B C | = 8$ and point E divides AB internally in the ratio 1 : 3 then the cosine of angel between CE and CA is (where, |CA| = 12) ?

- \frac{\sqrt[3]{7}}{8}

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\frac{\sqrt[3]{8}}{17}

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\frac{\sqrt[3]{7}}{8}

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- \frac{\sqrt[3]{8}}{17}

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Solution

The correct option is C $\frac{\sqrt[3]{7}}{8}$

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